Early human development is characterized by rapid and tremendous psychological and neurophysiological changes due to maturation and learning. Specifically, compared with adults, infants and children show a distinctly increased need for sleep. We hypothesize that this is partly related to the increased need to form memory. Against this backdrop we investigate how sleep and memory consolidation develop from infancy to childhood, as well as the interplay between sleep, learning, memory, and emotion processing during this period. Additionally, we investigate sleep and memory formation renatally, in the fetus, using fMEG.